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Protection method of multi-end flexible and ultrahigh-voltage DC power transmission system

An ultra-high voltage DC and power transmission system technology, applied in emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve the problem of not being able to put into backup protection, etc., and achieve the effect of reducing the peak value of fault current and the level of voltage reduction

Active Publication Date: 2019-12-20
CHONGQING UNIV +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot quickly switch to backup protection when the primary protection action fails, so this paper proposes a strategy to quickly identify faults in the primary protection zone and trigger appropriate DC circuit breakers

Method used

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  • Protection method of multi-end flexible and ultrahigh-voltage DC power transmission system
  • Protection method of multi-end flexible and ultrahigh-voltage DC power transmission system
  • Protection method of multi-end flexible and ultrahigh-voltage DC power transmission system

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0026] The technical scheme that the present invention solves the problems of the technologies described above is:

[0027] The present invention provides a machine learning-based k-means classifier to determine the threshold range and action time framework of primary protection and backup protection, and determine and classify fault types by measuring local voltage and current, thereby realizing fast backup protection action. Compared with the existing protection, the protection method realizes faster protection action and avoids the generation of large fault current. When the primary protection fails, the backup protection will act after accelerating to 0.2ms. At the same time, the relay protection sys...

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Abstract

The invention requests and protects a protection method of a multi-end flexible and ultrahigh-voltage DC power transmission system. The protection method comprises a rapid primary protection strategyand a backup protection strategy during primary failure. The strategy is a voltage- and current-based non-unit protection strategy. A short-circuit region is determined by sampling a voltage and current signal of a local position, combining a change rate of a fault current with time and combining k-means in machine learning, threshold levels and action time of forward fault action and backward fault action are judged, an appropriate DC circuit breaker can be rapidly identified, selected and triggered when primary protection of the multi-end flexible and ultrahigh-voltage DC power transmissionsystem is in failure, so that a short-circuit fault is eliminated within shorter time, a short-circuit peak is reduced, and the purpose of improving the safety and the stability of a power grid systemis achieved.

Description

technical field [0001] The invention belongs to the field of power system protection, and in particular relates to a protection method for a multi-terminal flexible direct current transmission system. Background technique [0002] With the development of DC transmission technology and the wide application of UHV AC and DC technology, my country has formed a large-scale multi-infeed DC transmission system and receiving end system. Although the multi-terminal DC system has higher compatibility, stability, reliability and security. However, when the AC failure of the receiving end system may cause the collapse of the entire system, the interruption of the DC transmission power will eventually threaten the safe and stable operation of the entire AC-DC system. The DC fault protection of multi-terminal flexible DC systems is one of the key technologies in the development of DC systems. The main technical difficulties include reliable identification and fast isolation of DC faults...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/262H02J3/36Y02E60/60
Inventor 杨帆贺婷婷高兵王金浩郑惠萍刘新元薄利明郝鑫杰程雪婷郝捷张颖
Owner CHONGQING UNIV
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